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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ac7f09f8ab67d4a1b0e1665f690b6068788bca23e794ce2e7140a8a010c52c' 
  AND token = '2rw8fjaggMzxjdz4YU8DZubPgklzzu1y1DY8Wr76aZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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