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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b793d8f2dfb3c2d6486c940f416ad295061265c0857f3b13f63ccf0769eaca' 
  AND token = 'dNouS8d5jL+0tjoFy0mGaM+xtw71xD37GxWKL9r8XM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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