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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025746294b5098742d41fa7bfcd34e84f497a104e1ab4911277e3cd4d598b4e2' 
  AND token = 'NiWWacRXIJIBVci+8TgjSG5cZ4RIqz584toMSHy9PDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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