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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35cec9f4854d7b92aeab8e22c03e11c983611db3737f28a39726770ba7cdf55' 
  AND token = 'QZoTY+JPUk7sAe3z1Igc+dzTBOllnTV84pEvybpdhcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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