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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6247c696f546312e68c1dd66eb75040a0517926fb1f8855189933203724c389' 
  AND token = 'G1QSNxuNes5fikc5hK9M1xEKa0oVWrCCX9E532i6tYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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