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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c503b209bd6f65a9e9cc7041a8050d1acd48fc3f0f261a05c5cb0d4e72abc4a2' 
  AND token = 'QECAxNkzqB/lYoN+P2Oy5Rlzt/iuN+Eb++ETs658FZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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