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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2eef21d74ec6fc4a15e8790a389bb46e4bc1644742593019e0b755e5cbccdc1' 
  AND token = '0WRN2iJy+I49zIjADbhGpDK9/AHzQZTZxhs+p6/flbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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