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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac2f8da8ec9ccfec4d3be93c2ce4de5adc114ada025d906d8a8438d6fc6eff0' 
  AND token = 'tvEgBcKJDq1B+6J8F4vBNrFTqtvq0qWWIpxFnNUoW74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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