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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c61d8ce0b72f50748aa003c2969f98f15016e1f4adff412aaa1e8441ee77a9' 
  AND token = 'MWGTwucnRtYZgHGdfqDNlaUcrintDR8bywSu56N8Oqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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