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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b0da6345bad642f04fb2669bbaf3371f6c30791fddf42c8d0659974bd33a0c' 
  AND token = 'GUX31JpAg/aLgwEI7A4AMfMuWZZg0/IsZ9ibILKWD/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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