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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e513bf9a4f5df8e120a42e69bd129b311b825bc4862ecef50c9a934005b3b9' 
  AND token = '9pT1dTzeDmxX4X+3W7APGdRdFhfn7MPYYwIXgDM1Emk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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