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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661f59aa275564c11e955b6c59ab6232b9a084a6a848f8be22c4e6c5920737bc' 
  AND token = 'qaLZ44sWHPqEGsBOhaVqFy0NkKtnnEofWFmLkj+Z094=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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