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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcade2bcdddd56023c2d94f1d64eb31ea2f5c6786a6f46625a580d92674fce6' 
  AND token = 'afCqB8AMdq0jwBHV1uJL3NB869qJ+XO/8gyiZwiJyqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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