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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33ebf3455c0f8a68f7a7aa510e7b43a0f90eccd33a8fdcf00e3032601af4e80' 
  AND token = 'bLC9K7ewhHqRB+Nz0OiPyoAvFC75FfmsDlJ1oxX2UlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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