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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dee0ec546f17fb581473d5a8716ed67319277996d705102c7205ee9dcaf08a3' 
  AND token = '4xJn45u4t1EIN1R7wST76DIaRoQmVMUuOI/2LB/hWV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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