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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d28aca014484700d6aea3f938228ff76992ddea2abc96c3a2085ddbd590f22b' 
  AND token = 'E+tBiOBHpR95ILJGfcU1DVWmn4s0R0TKFkHvLM2EkX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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