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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7c463944c5704d5072f8efea7c4afb1449420c882b06acfafb6aa3b65ab9f4' 
  AND token = '6n0wxReCeDjGGfdc/4MRnKWKEhJgzTUjoZ3HFy+mbZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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