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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74b29210f76ced50591ea06a6b826a82ddbbba00e328750bb17b7a31b1cfeed' 
  AND token = '0iR0ozS17kNCYHPTD6bd07kkZym+o0h8Ykl190+Y1EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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