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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadcd34a3a21af56101b97bf748940313410456d2a818eb9736d53e9e60e9d62' 
  AND token = 'lRaZ/9ODnLVFqXZki3rpRQMxxaW7bqnITEPdeLMIZME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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