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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d317d2545b3ba04d606e50e57606d58af28fbc3cfadbf0baba0b584b4857abd' 
  AND token = 'em4i5HBUsW2WcnRRwBOpevOHGiPeijeo2oQWmTiksec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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