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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cd62bed50756cb81d7acbfe7bc83099d6a6fa901caec169d027bc4d60448e6' 
  AND token = 'grD9HikX8+Z7wPm67Mp2tiMnpa2l/wMTqEEVNO5x3Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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