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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cebc8fcbf2670d71dd72bf5137423c3b788845ee07210d2bc3fe53a8612482' 
  AND token = 'fED8dXAVbWd6olJOCKiwc7RdbAYdE+KPb4XLOZhv4dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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