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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770eff01e9f5ba30e35abe4a14d20aa10fd1d0ff16d82e9e5059b214d3478432' 
  AND token = 'tkesBFreURV17smq7VYBOnmSmRJ4gwGQPU7NS9mM9Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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