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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7b1352eec64c2409af15ce5aa000c6ba3bc638dbe632babfa09ea1775e9dfe' 
  AND token = 'zOjJZKq+fN1hH5DOLhx/oi+LQpPlEVQgrfJE59SNrIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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