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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197f3646f6b9143a49ea0cbd2b4cbad61c908fabef6767df4232ac07033b70c9' 
  AND token = '7mEZn3evBa619uEWJbwyDj5bAn7LqvTQG4znAacWmas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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