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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7f1f041160ca615af269b171e16b032b47d74d96d456e875bb4667e011e5f2' 
  AND token = 'c0Eme7lHAkilELMte5l7L/cBz55Z78lfYMFyRu1xnCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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