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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8837edf86ebfd68438d24b2bae0b7fc98d06b2ac80b723427f17127f44dd41' 
  AND token = 'WkdN+HU45sZaApLnS5mifQCMV9/kRtZEBWCFF544g44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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