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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7291d28a23890b67f314c8ed3bf97dba8bb1d74db6b692f8079b5daa22f863ba' 
  AND token = 'n7tKUVs+HWulAHbiJIRxlUG80ojm/ybXvaUb99dXStQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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