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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2fd56870e2d2037a933e1e2a12901242cbbcdfded18d59021c0a6e8183e7dc' 
  AND token = 'yQlwJfMKiH6OTu5MXtVPad8JUT616nc/N9oIG9ObMkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}