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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35cfca983c6e31d6194bb7d0934a02598af2d216314a921eada7d2d18e15f9d8' 
  AND token = 'MjGsW0sLD3K+ylDa28l6RLK7BPp/+FuMAj9C4cnLnZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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