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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab3c74cbedc1cdb3a291c046bad82d6e4aa3a9a14fbda7886f9ad149ef095b0' 
  AND token = 'kfd+ghL+88l9dlqt4MsKvT//i+ug08bda97lKBjBjUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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