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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73448e3546b63c20d1a3f9053389e3be8ca6d6e0c05933a20afe3b4f39578c2' 
  AND token = 'Sdw5VcgRQbQI14d2JIQWQDy1T/mySR5djbp8bBLSifg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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