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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ca9afed57344ea67da37397c98005ba8acfca3be37bb9a7055d00a3c852544' 
  AND token = 'sgRjyopC474BzmGtAcKU6YqbIALIjDxfYyBZW0GKSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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