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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbc1a1eeeb96dae06df263c8277fbe78205024e829a9c039ba2e7a441161f1d' 
  AND token = 'e4xUuMuAxlosLDK+HokJ9W2lnpb2BSudF9bSugEq+JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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