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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc1bf06b347ae3b3cc6b2093834560563051e5b9068a107d4061c585516eb90' 
  AND token = '7q7QxB3IsBfLOPbdrB2XO3wQsf0lPSur/++D8u/DPL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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