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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47294d97008c5ceacf6217f238ee1a5970789c94c14fc8639df748eca3e63c4c' 
  AND token = 'Gjipv605wAZRWXb3/d0uzSkeG3hrJltEDuEz9HnBcgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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