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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb78d09378b4890d1fdc39b1f90b34a7a78daa88c90894e646107fa2829754e7' 
  AND token = 'Tol+A3KkloIJzNFS4c8ghqTCntJdKmsIFP5IkHWU46E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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