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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f7bb9b5e4d1ef16b736fc4da421573f70b08d3fc793debb67707092855275e' 
  AND token = 'mJqbq4KUQ8ecMegaUFFNJFgn0xPfmENUe8e6+t8ijIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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