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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4136aea1f67f77ca17eaab1ecd8b46814a943c00422b1c0ead362a5072bd7bb5' 
  AND token = '9lre6f2Pt+Bsba917yFA0YNTdP6HkMyfs6zB8xY3JCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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