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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf99cb2d4fb86073b925caab1cd159f99d94f4e392355bbbab8a99576ced731' 
  AND token = 'L/b+brajs271o1JVPCSU+GczLbpRgypugdVRZTxWfP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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