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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53e19bc092d2b62b51e75a1f10413103221328b2d0b631a59e1f36618211e7b' 
  AND token = 'amk9Hk+0r7q2iuQc5KCK1q2ZMjPYJRvPJGsBT6B6ItU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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