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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ae4541e20f2cb1f44fdab3fd3bb7860c2e4053899d0ed8403b8373e57528b5' 
  AND token = 'T41hVzhkRyngripTz19S2Zi9aDYVGurL+gtIazVwUp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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