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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa5db7c00109e61da0661aec471c6fe1cce1c825e3fd9a89c8d60c4d33d7a98' 
  AND token = 'SwYh9EkP8QX8Xun0Leov+WJNfkaee5GkjUuX72KpTMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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