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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ffaa3e5d44ff93afd2183e72b6b384dc552c687fa4ad8d0b8ff01f18e5fef4' 
  AND token = 'SUWCwUMN6oMgSXEk7p3PZ2K6lrL5tvSWMe7E81zlpso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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