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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bd7813916ed41686dfdac8f0dd895a76b4bda1679cb2abf91325096b0d5e5e' 
  AND token = 'bO5EL0p7n5mfGD4mZj5gn8N4gYy64zFoyUH4aQ6Pv2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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