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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a70e60269b6ba65e4648df84ac7102875292d4383a4ec346981ac6bd5a2efe' 
  AND token = 'U3sTVVi2xh0Nyo6LUgDTdcyQgzNSTQw9o9n/AXu9m94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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