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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7065f15892adb1c65a669ccb4058b96ba5121d1f949df05626c770d77eaf0d' 
  AND token = 'BPpC6ToIssy+YdQUrXpmkKH2TRgTnSqHP9jll9HkspE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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