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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a33f4b261b62789632e340d5fe7be83b9ce1e04693bb13d3c0bbfd258ade56' 
  AND token = 'L5aD94zo0rmf/0V0gF/deQQzLMNplg316/Vyzz2QPYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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