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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a44fcf1a3ef076d5d3b0433f7e2a4120524adb53f621dd0530d0fb3275fef45' 
  AND token = 'ri0A7g6Kb6O2EZfbcVj7CC96YdpvNzZPJ3JIF00Bf8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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