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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcbf0bc879ff9a44f00c65c7d7466b2dbf5003c0b429bf6283c45f4eed5a594' 
  AND token = 'eGew4LL9neD/SDZES9IYl8kDv+esXO/U150RG8A8JMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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