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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97102221507ac0b6e3786ff0872c2dfdcf9dfcb642ddbd2fea8abd5f6434d864' 
  AND token = 'dKj2YiCnsk/S9YSzpzdyUz9WYKNDVYHi9msIo1LFN9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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