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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0df0c02779f89a15b74ffc3ce62e94ae55a2157c867980279cac791e2c00ba' 
  AND token = '7bHO/Ktt8M7mHlEymCPGdFoQGy8iS0QRpkhhtSAcqBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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