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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befbde08f620693802c0ac903fc95b4022a43c8d0bca38b76aea5fd5e61f6309' 
  AND token = 'f6MWSP0RPKgEsOiUTDVuvvmhb97WhJn0OTGdgbA6zrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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