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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852846ba1e497fcf7372772355c355b9ad34055836379e654fd7bad13f39a78b' 
  AND token = 'LMSsOqDXk2MrAecSdIbRE6Q9TeOywy+Qzf+Nabo++do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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