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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec6d682696d7eae9f47def00e93a0b2b83937cfc5284a36fbc68a68b0ebcf6a' 
  AND token = 'oS4qLGR0P5UqgrtwjuUyYk+rLnVgcF+EFGgx2pQ4Na0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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