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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e603c45c73c6a8ad8a2bec74839131dc70ac33a72ea3500ce8b98a950a8e32' 
  AND token = '+6D9MoVqUb6Rvx861jssS3qn281mUGVAHLSVMa2WjFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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