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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864073bc0f24320baefea52d39d31ec9cbbe98c52564a8dd3591d0079b72d248' 
  AND token = 'TKauI+jD4k16HLfG723hZ9Kh1sm6ypr4vCQ4OJeDD4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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