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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b712f7c5265559ca390006f494f40835bf47ff2b3cac4bd006a773e2c041481d' 
  AND token = 'M2G6zXDbenXemYG4ufBjOv/0Ag22aYSwLRptjIQZ0fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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