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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7cdd3edfdc0005fcbb8fed2be47d3ccde803871b533bfab071ed4443a2e06c' 
  AND token = '4cOc2eyw1EoHTHmwAMoiD4wES1Ry2IfN6WvqpX60jqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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