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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8dca2c2ba64f87a606ba185550f7f629c3c7ccd25d5364daf5c15aca9337e5e' 
  AND token = 'n3SpI8bxW89wp5GodHj7USaAIb1AJtz5B/F9V1rjd/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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