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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae026f3852071f2a33029449f81cda99967f7f7c5ab2e317e6093e544d0ba01' 
  AND token = 'jdiRtYgawjsLaW2beOe9y+GHjN8OkmYXiLsWVgHW0Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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