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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551b2d5ead0317820ef52ec9b7885e28f20e9df94ec6c1ab1e8810a7c6cf35a7' 
  AND token = 'I8iG/EvWkGSt6IGS+pLg9iJGMrbM/lEqmO6rKKmYiU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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