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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855dfd42e2e3c96847b4c2092b976e4139ac0b28b024df1e452e15a2ce424b0e' 
  AND token = 'RN7E+qFU+UBlsObqmZoCD0+dqEXekEOJOSNoSUX7IQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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