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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365cc961dcf993a96398a34b5873efcca1aa0c8023bea57ea8e03f115e82bf3c' 
  AND token = 'aWiAA5rvhAvZxn5ozrbVoT18GHO0Fb+ghMzdEJH+790=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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