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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116984b3a46d3f5b6a796f287ceddf6e35f6c12abcab1712e041d028d5611651' 
  AND token = 'B+SvFHQXBwKoHoGmWclDY2e3+F9/NAoB3seTY7t3oU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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